低产银杏树丰产技术

通过几十年的调查研究发现, 银杏产量低而不稳定的主要原因是立地条件差、管理粗放、雄株不足和授粉不良。70 年代以来通过推广施肥、老树更新复壮、人工辅助授粉和高接雄花枝等技术, 使临安市银杏年均产量由70 年代的44.4 t 上升到80 年代的85.2 t , 产量的年变异系数也相应下降, 实现了丰产稳产目标。表3 参6

High yield techniques for gingkgoes with low yield

Dozens of years of investigation showed that the low and unstable yield of gingkoes was caused mainly by the poor site condition , careless management , insufficient male stalks , and improper pollination .Since the 1970，s , via such techniques as delivery of fertilizer-applying , pruning and regeneration of old trees , aftificial pollination , and graft of male -flower twigs high up on the tree , the gingko yield has increased from 44.4 t in 1970，s to 85.2 t in 1980' s .The variation coefficients have likewise decreased , demonstrating a yield both high and stable .